exhaust backfire


Information and questions on GL1100 Goldwings (1980-1983)
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blackbeauty
Posts: 14
Joined: Sat Jul 09, 2011 10:33 am
Location: Stanton,Michigan
Motorcycle: 1980 gl1100 Interstate
1977 gl1000

exhaust backfire

Postby blackbeauty » Mon May 26, 2014 9:55 am



I have an 80 wing and replaced the stock exhaust with a set of fishtail pipes over the winter, I am getting a pop while riding and also on slowing down. The bike is getting about 38 miles to the gallon and runs ok. It does have a fall on its face at above 5500 rpm, but just cruising it does good. I synced the carbs this spring. Am I looking at timing issues. What if any problems can come from this.

Thanks



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Sidcar
Posts: 502
Joined: Thu Jul 05, 2012 3:07 pm
Location: Birmingham, England, United Kingdom
Motorcycle: 1991 GL1500/6 with Watsonian Oxford sidecar

Re: exhaust backfire

Postby Sidcar » Mon May 26, 2014 2:30 pm

Check for an air leak on your exhaust. Any air drawn in through the leak on overrun will cause popping back in the exhaust.

Sid

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themainviking
Posts: 2579
Joined: Wed Sep 29, 2010 6:59 pm
Location: North Bay, Ontario, Canada
Motorcycle: 2009 GL1800 AD

Re: exhaust backfire

Postby themainviking » Mon May 26, 2014 2:53 pm

Also, you may have created a lean condition with the fishtails if they have no baffles in them, which could cause the popping you are experiencing on decelaration. Installing baffles in the fishtails could eliminate your problem, although definitely check for a vacuum leak as mentioned above.
It ain't about the destination - it's all about the journey

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dingdong
Posts: 2863
Joined: Thu Apr 08, 2010 8:35 am
Location: Oklahoma City
Motorcycle: 1976 gl1000
1993 gl1500
2004 NRX1800 Rune

Re: exhaust backfire

Postby dingdong » Tue May 27, 2014 6:11 am

Another possibility: Your carbs have "air cutoff valves" that are designed to eliminate backfire on deceleration. One or more could be bad.
Tom

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Bogator
Posts: 87
Joined: Sat Aug 13, 2011 2:58 pm
Location: Valley
Motorcycle: 1998 valkyrie

Re: exhaust backfire

Postby Bogator » Sun Jun 01, 2014 6:09 am

OK, this is what I found on my Valkyrie, vacuum lines --rotten---I replaced all ,and then I tightened all header bolts, be careful with these and don't over tighten, you might find another problem with the wiring but ---try --the first of these and then see hope this helps GOD BLESS


GOD BLESS


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